William Optics Adjustable 0.8x Focal Reducer & Field Flattener 6AIII for GT71, GT81, Z81 & Z103 Telescopes - Space Gray

Product Details

Please note: As of late-September, this item now comes in black with a gray trim only as pictured. It is no longer offered in a gold trim as before. Other than the color, the two versions are identical.

All New Adjustable Flat6AIII (T-mount not included)

This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. WO Flat 6AIII will provide good illumination and flat field across 97% of full frame sized sensors.

Full frame size

• Designed with nearly Full frame chip-size DSLR cameras in mind.
• FMC triplet APO design.
• Produced entirely with the best Ohara optical glasses.

Amazing

• Reducing factor 0.8X.
• Adjustable design, for perfect back focus it can be used with other models of refractor
• 48mm filter ready

Superb Finish

• William Optics polished anodized finish.
• All internal surfaces threaded and blackened to prevent reflections.

Easy to Use

• Will accept any standard 48mm wide T-ring for your camera. Not compatible with smaller 42mm T rings.

Compatibility

• Gran Turismo 71
  • Adjust Distance: 9.1mm
  • Back Focus: 64.1mm
  • Image Circle: ∅44.4mm
• Gran Turismo 81
  
  • Adjust Distance: 7.1mm
  • Back Focus: 62.1mm
  • Image Circle: ∅44.4mm
• Zenithstar 81
  
  • Adjust Distance: 5.2mm
  • Back Focus: 60.2mm
  • Image Circle: ∅44.3mm
• Zenithstar 103
  
  • Adjust Distance: 2.5mm
  • Back Focus: 57.5mm
  • Image Circle: ∅43.1mm
• Fluorostar 91 + Front Adapter
  
  • Adjust Distance: 5.4mm
  • Back Focus: 60.4mm
  • Image Circle: ∅44.4mm

Specifcations

• Lens Type: 3 Groups 3 Elements
• Length: 61.5 mm
• Telescope Thread: M63 x 1 x 6 mm
• T-mount Thread: M48 x 0.75 x 4 mm
• T-mount Supported: Canon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4/3); FUJI X
• Camera Format; > Full Frame
• Weight: 519.4 g / 1.1 lbs

Other Information

• Country of Manufacture: Taiwan